Wikipedia:WikiProject Measurement/Assessment

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The WikiProject Measurement assessment scheme is a two-dimensional qualitative classification of articles in the fields of metrology and measurement in general, which aims to give basic information about each article within the subjective notions of "quality" and "importance". It is based on the assessment scheme introduced by WikiProject Chemicals in 2005 and further developed by the Version 1.0 Editorial Team (WP1.0). Schemes of this type have been shown to be reasonably robust over a wide range of subject areas and a large number of individual reviewers, although this is not to pretend that measurement uncertainty has somehow been eliminated.

The quality scheme consists of a five-point scale (Stub–Start–C–B–A) assessed by reviewers from WikiProject Measurement, complimented by the quality grades attributed by centralized Wikipedia assessments (good articles and featured articles). It has proved impractical to separate the variables of "encyclopedic content" and "Wikipedia style", although it is assumed that project reviewers will, in general, be more concerned with aspects relating to the metrological content of articles than external reviewers, and hence correspondingly less concerned with aspects of style. The scale may be viewed as the one-dimensional projection of some hypothetical two-dimensional classification. Once an article reaches A-Class, it is considered "complete", although obviously edits will continue to be made.

It is critical that people not take these assessments personally. It is understood that we all have different priorities and different opinions about what makes a perfect article. The aim is to provide a tool for the project and for all editors who are interested in topics related to measurement. While a volunteer project cannot tell people what to do, and all contributions are welcome, the assessment scheme provides basic information about what needs to be done at some point and by somebody, and which are the more important among the outstanding tasks.

Quality scale[edit]

Project scale for prose articles[edit]

Any editor may assess an article into one of these five classes, although it is obviously helpful if the reviewer has at least some knowledge of the general subject area. Article assessments can and will be modified if the article doesn't meet the criteria below, although the most constructive approach is to improve the article so that it fulfills the criteria. To try to ensure some consistency of grading between different subject areas on Wikipedia, WP:MEASURE uses standardized criteria for B-class assessments and interdisciplinary peer review for A-class assessments (details below).

WikiProject article quality grading scheme


The decision on the B-class/A-class boundary is the most difficult to make, especially for a small project such as WP:MEASURE. The basic criterion is "well organized and essentially complete".

"Essentially complete" doesn't mean "exhaustive". There are several issues which need to be considered, such as article length, the likely audience of the article and the appropriate weight to be given to different aspects of the article topic.

"Well organized" should mean essentially free from serious style faults, although not necessarily to the degree that is required for a featured article candidate, either in the article itself or the effort put into reviewing for style matters.

If the reviewer can find something which he/she thinks should definitely be in the article but isn't, the article is not A-class. If the reviewer cannot find any such deficiencies in the encyclopedic content of the article, he/she should look for other people who might be able to find them. The way to do this is to open a peer review on the article, and notify any WikiProjects whose field of interest might touch on the article subject. For Apothecaries' system, the following projects were contacted: Physics, Chemistry, Pharmacology, History of science, Medicine, Science. A note should also be placed on this project's talkpage, obviously!


WP:MEASURE assesses B-class against the six B-class criteria developed at WP1.0. The project banner will not allow an reviewer to assess an article as B-class unless the reviewer fills in the checklist to show that all criteria have been checked and are fulfilled.


List-class exists as a recognition of the difficulty in assigning a meaningful quality criteria to many lists. It is an optional class: lists may also be assessed using the five main grades above if the reviewer is confident that the list meets the relevant criteria.

Project scale for other types of page[edit]

The other classes listed here are used purely for project management purposes. Pages tagged with these assessment classes do not contain encyclopedic content as such, although they may form part of the encyclopedia (Template-class and Cat-class).

Community scale[edit]

These classes are awarded by centralized Wikipedia processes and the assessment and review is independent of WP:MEASURE. For more details, see Wikipedia:Featured article candidates, Wikipedia:Featured list candidates and Wikipedia:Good article nominations respectively.

When an article (or list) receives one of these Community-level grades, the relevant parameter on the project banner should be set: FA=yes, FL=yes, GA=yes. Do not use class=FA etc.: the banner will interpret these as A-class (for FA) or B-class (for GA) assessments, but the article will not be correctly categorized unless the additional parameter is also set. The community grades for measurement articles are not followed by the bot to avoid double-counting of articles.

Importance scale[edit]

Within a WikiProject, importance or priority must be regarded as a relative term. If importance values are applied within a specific project, these only reflect the perceived importance to that project. An article judged to be "Top-Class" in one context may be only "Low-Class" in another.

The WikiProject Measurement importance scale is internal, relative and, of course, subjective. It has been adapted from the scale used at WikiProject Psychology.

Importance WP 1.0 criteria Project criteria Examples
Top Subject is a must-have for a print encyclopedia Subject is a must-have for Category:Measurement and is considered a core topic. The article is a likely target for encyclopedic research. Metrologists and other experts in measurement will generally be well-versed on the topic, and many non-specialists will likely have some familiarity with it.
  • SI base units and their corresponding physical quantities
High Subject contributes a depth of knowledge Subject contributes a depth of knowledge to the field of metrology. Most experts in measurement will be familiar with the topic. The subject can be found in most academic studies of metrology, and a significant amount of published research exists for it.
  • SI derived units and their corresponding physical quantities
  • The most widely used customary units in English-speaking countries
Mid Subject fills in more minor details Subject fills in more minor details but is still important to the field of metrology or to measurement in general. Many specialists are knowledgeable of the topic. Published research from a variety of sources exists for the subject.
  • Other customary units used in English-speaking countries
Low Subject is mainly of specialist interest. Subject is peripheral knowledge to the field of metrology and possibly trivial but still notable. There may be limited research on the topic, or most professionals in metrology have not yet taken note of it.
  • Customary units in non-English-speaking countries.
  • Organizations and laboratories in the field of metrology
NA Any non-article page that does not fit into any other category. The page does not have article content. List-Class pages should not be tagged as NA-importance, but templates and categories should be. All project pages are NA-importance.
  • This page

There are also several external lists of "very important articles". For example, there are twenty articles related to measurement on the list of vital articles. The fact that an article is on one (or more) of these lists may lead to an editor placing a higher project importance rating on the article than would be suggested by the examples above: the scale is only a guideline, and there may be some exceptions.